Author: John Merlino
Date: 17:04:50 09/22/05
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On September 22, 2005 at 07:00:13, Paul Jacobean Sacral wrote: >On September 22, 2005 at 05:39:07, Mahesh Jeswin wrote: > >>Only Fruit 2.1 seems to find the draw in this position without egtb. >>Any other engine comes close to finding the draw ? >> >>[D] 7k/7P/8/6N1/7K/8/8/8 w - - 0 1 > >I didn't find any! Good test position. At least engines which do not use egtb in >the search, should probably have code for that type of position, or a "no >progress" rule. Engines quickly reach depths of 20+ in this position. With a >material balance of +4 and no progress at all after 20 plies, it is most >probably a dead draw. I think that could be a "safe" rule, if the opponent has >only the king (maybe even 10 plies are enough already, in those cases). > >Yours truly Paul J. Sacral The King (CM9_R1) is pretty weird with this one. It immediately gives a score around +6, and after a couple of seconds it is down to about +3.75 at depth 34. On the next depth, and all the way to the engine maximum depth of 46 (which it reaches in 0:11 on my AMD 2500), it gives a score of +10.75! The PV, of course, shows no progress, so this is some bizarreness in the evaluation that I have never seen in TK before. jm
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